/ Dictionary / Index M microinjection: Meaning and Definition of Find definitions for: mi•cro•in•jec•tion Pronunciation: (mī"krō-in-jek'shun), [key] — n. Biol. injection performed under a microscope, esp. of a solution or gene transplant into a cell or cell part. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. microinject microinstruction Related Content Daily Word Quiz: labyrinth Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language